Fair Value Measurements - Fair value on a recurring basis - Significant observable inputs (Table) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Interest rate swaps - asset position	$ 0us-gaap_DerivativeAssetsNoncurrent	$ 91us-gaap_DerivativeAssetsNoncurrent
designated as cash flow hedges
Derivative [Line Items]
Interest rate swaps - asset position	0
Derivative Liabilities	7,732
not designated as cash flow hedges
Derivative [Line Items]
Interest rate swaps - asset position		91
Derivative Liabilities		0
Interest Rate Swaps \| designated as cash flow hedges
Derivative [Line Items]
Interest rate swaps - asset position	0
Derivative Liabilities	7,732
Interest Rate Swaps \| not designated as cash flow hedges
Derivative [Line Items]
Interest rate swaps - asset position		91
Derivative Liabilities		$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References+ Details